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Occasionally there is interest in GAMS, but it is currently not available on the cluster. A few GAMS PC licenses are held by faculty throughout Tufts. If you have GAMS code and need to run it without having a license you should consider the public GAMS server service. Check the GAMS Model Library page. Alternatively, Matlab's Optimization Toolbox and Mathematica may address your problem setting for mathematical programming problems.